The qconfig utility sets or queries the QNX configuration files.
It supports the coexistence of multiple versions of Neutrino on one machine.

To change the version of QNX Neutrino that you're developing for
on a Windows machine, use
QWinCfg
instead of qconfig.
QWinCfg changes the registry on your machine;
qconfig changes only the settings in your current shell.

Whenever you install a version of Neutrino, a configuration file is stored
in a directory that depends on the host OS.
Each configuration file defines the name of the installation and its
base, host, and target directories.

The QNX_CONFIGURATION environment variable usually identifies
the directory where the configuration files are stored, but you can override
it by specifying the -d option.
If neither of these produces a valid location, qconfig looks in
/etc/qnx/qconfig before giving up and returning an error.

If you don't specify an installation with the -n option,
qconfig uses the most current installation.

You can use qconfig to query your current configuration in
a human-readable format, or you
can use the -e option to set up your environment to use a certain
installation.

This utility doesn't list the installed packages in any particular order.